Here's the deal I made with myself: Get under 160 pounds and ride existing bikes 2000 miles and you are allowed to treat yourself to a new bike.
I'm now 155 (from over 190) and have about 500 miles to go to reach 2000.
I've started seriously shopping, and I think I'll roll the dice and get a BikeDirect.com bicycle.
If you want to read people going nuts, just say BikesDirect.com over at Bikeforum.net. They are either evil, or the answer to life. A waste of money, or the best deal in town. My plan: To find out, and blog it all here.
I'm looking really hard at the 2007 Motobecane Le Champion SL.
Along the way, I'll post about my commute experiences and other bikes. Let's see how it goes!